Expeditious synthesis of fluorinated styrylbenzenes and polyaromatic hydrocarbons
摘要:
A series of fluorinated styrylbenzene derivatives were synthesized by the Mizoroki-Heck reaction using phosphine-free catalytic conditions or by adopting the one-pot Wittig-Heck reaction sequence. The fluorinated styrylbenzenes were converted into polyaromatic hydrocarbons such as phenanthrenes, [4]helicenes, and benzo[ghi]perylene by a modified photocyclization procedure involving I-2-THF condition. (C) 2012 Elsevier Ltd. All rights reserved.
Thiadiazolidine 1-oxide systems for phosphine-free palladium-mediated catalysis
作者:Benjamin R. Buckley、Stephen P. Neary
DOI:10.1016/j.tet.2010.08.018
日期:2010.10
We herein report several highly active catalyst systems with thiadiazolidine 1-oxides as ligands for palladium in the Mizoroki–Heck reaction. Excellent yields of stilbenes derived from aryl iodides and bromides have been achieved using as little as 0.00002 mol % catalyst. The ligand/palladium system can be stored as a stock solution open to air at room temperature with no observable loss of activity
β-cyclodextrin-capped palladium nanoparticle-catalyzed ligand-free Suzuki and Heck couplings in low-melting β-cyclodextrin/NMU mixtures
作者:Xiaohua Zhao、Xiang Liu、Ming Lu
DOI:10.1002/aoc.3173
日期:2014.8
Low‐melting β‐cyclodextrin/N‐methylurea (NMU) mixture, an efficient catalytic system for ligand‐free Suzuki and Heck couplings in the presence of fresh native β‐CD‐capped Pd0 nanoparticles, has been successfully reported. This natural and convenient system can be performed in air and could afford the corresponding cross‐coupled products in good to excellent isolated yields after a simple workup under
The catalytic reactions proceed with good yields with a low catalyst loading (1 mol%) under aerobic and CuI-free conditions for Sonogashira and Heck reactions.
The First Thiadiazolidine 1-Oxide System for Phosphine-Free Palladium-Mediated Catalysis
作者:Benjamin R. Buckley、Stephen P. Neary
DOI:10.1002/adsc.200800522
日期:2009.1
We herein report a highly active catalyst system using for the first time a thiadiazolidine1-oxide as a ligand for palladium in the Mizoroki–Heck reaction. Excellent yields of stilbenes derived from aryl iodides and bromides have been achieved using as little as 0.00002 mol% catalyst. The ligand/palladium system can be stored as a stock solution open to air at room temperature with no observable loss
Synthesis, structure and catalytic activity of xylylene-bridged dipalladium complexes with triazolylidene ligands
作者:Yufeng Du、Beibei Liang、Fenglei Yang、Yanhui Shi、Xiuling Li、Guangsheng Pang、Changsheng Cao
DOI:10.1007/s11243-016-0117-5
日期:2017.4
di-N-heterocyclic carbene (NHC) dipalladiumcomplexes, [PdPyBr2]2(di-NHC) (2a–h), in which di-NHC represents a di-triazolylidene, featuring a 1,4-xylylene spacer between the carbene units, have been prepared from the reactions of the corresponding ditriazolium bromides with PdCl2 and excess NaBr as an additive in the presence of K2CO3 in pyridine. All of the complexes were fully characterized by NMR